Harrison, L., Snelling, R., & Travis, P. (2021). Practice tests for IELTS (First edition.). HarperCollins.
Lua i Stíl Chicago (17ú heag.)Harrison, Louis, Rhona Snelling, agus Peter Travis. Practice Tests for IELTS. First edition. New York: HarperCollins, 2021.
Lua MLA (9ú heag.)Harrison, Louis, et al. Practice Tests for IELTS. First edition. HarperCollins, 2021.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.